3. ZINC AND BORON APPLICATION ON GROUNDNUT YIELD AND NUTRIENT UPTAKE IN COASTAL SANDY SOILS by D. ELAYARAJA AND R. SINGARAVEL
In determining the yield and quality of groundnut, the role of Zn and B is much pronounced. Restricted availability of these nutrients in sandy soil greatly impairs the yield of groundnut. A field experiment was conducted to find out the effect of micronutrients viz., Zn and B on the yield and nutrients uptake by groundnut in coastal sandy soil. The experiment was carried out in a farmer’s field at Ponnanthittu village in Cuddalore district, Tamil Nadu during December – March 2007. The initial fertility status of experimental soil was pH–8.39, EC-1.61dSm-1, organic carbon 2.7g kg-1 and represented low status of micronutrients. The various treatments included were T1- Control, T2-100% NPK,T3 -150% NPK, T4-150% NPK + ZnSO4 @ 30 kg ha-1, T5-150% NPK+ Borax @15 kg ha-1, T6-150% NPK + ZnSO4 @ 30 kg ha-1 + Borax @15 kg ha-1 along with composted coirpith @ 12.5 t ha-1. The experiment was carried out in a Randomized Block Design (RBD) with four replications, using groundnut variety VRI 2 as test crop. The results clearly indicated that, T6-150% NPK + ZnSO4 @ 30 kg ha-1 + Borax @ 15 kg ha-1along with composted coirpith application in significantly increasing the yield and nutrients uptake by groundnut. This treatment recorded the highest pod yield of 2466 kg ha-1 and haulm yield of 3354 kg ha-1 which represented 31.31 and 25.95 per cent increased in pod and haulm yield, respectively over 100 per cent NPK application.
KEYWORDS: Zinc, Boron, groundnut, Coastal Sandy Soil.
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